Segment Information - Balance Sheet Information by Operating Segments (Detail) - USD ($) $ in Thousands	12 Months Ended
	May 01, 2022	May 02, 2021	May 03, 2020
Segment Reporting Information [Line Items]
accounts receivable, net	$ 22,226	$ 37,726
inventory	66,557	55,917
property, plant, and equipment	41,702	44,003
right of use assets	15,577	11,730
total assets	177,563	214,080
cash and cash equivalents	14,550	37,009
short-term investments - held to maturity		3,161
current income taxes receivable	857
deferred income taxes	528	545
other current assets	2,986	3,852
intangible assets	2,628	3,004
long-term investments - held-to-maturity		1,141
long-term investments - rabbi trust	9,357	8,415
other assets	595	2,035
capital expenditures	5,821	6,905	$ 4,633
depreciation	6,994	6,846	7,827
Operating Segments [Member]
Segment Reporting Information [Line Items]
total assets	141,137	147,055
depreciation	6,994	6,846	7,827
Operating Segments [Member] | Mattress Fabrics [Member]
Segment Reporting Information [Line Items]
accounts receivable, net	9,865	20,427
inventory	39,028	30,047
property, plant, and equipment	38,731	41,694
right of use assets	3,469	4,278
total assets	91,093	96,446
capital expenditures	3,383	6,226	3,475
depreciation	6,200	6,014	6,712
Operating Segments [Member] | Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
accounts receivable, net	12,361	17,299
inventory	27,529	25,870
property, plant, and equipment	2,030	1,495
right of use assets	8,124	5,945
total assets	50,044	50,609
capital expenditures	1,032	347	348
depreciation	794	832	765
Operating Segments [Member] | Discontinued Operation [Member]
Segment Reporting Information [Line Items]
capital expenditures			135
depreciation			350
Unallocated Corporate [Member]
Segment Reporting Information [Line Items]
property, plant, and equipment	941	814
right of use assets	3,984	1,507
total assets	177,563	214,080
cash and cash equivalents	14,550	37,009
short-term investments – available for sale		5,542
short-term investments - held to maturity		3,161
current income taxes receivable	857
deferred income taxes	528	545
other current assets	2,986	3,852
intangible assets	2,628	3,004
long-term investments - held-to-maturity		1,141
long-term investments - rabbi trust	9,357	8,415
other assets	595	2,035
capital expenditures	$ 1,406	$ 332	$ 675